Method and apparatus for maintaining long term evolution traffic in power limited dual connectivity scenarios

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a user equipment (UE) may determine that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determine that the UE is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode; determine that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and transmit an indication that a failure has occurred to the secondary cell group based at least in part on those determinations. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 753,610, filed on October 31, 2018, entitled “SUSTAINING LONG TERM EVOLUTION TRAFFIC IN POWER LIMITED DUAL CONNECTIVITY SCENARIOS,” and U.S. Non-Provisional Patent Application No. 16 / 667,701, filed on October 29, 2019, entitled “SUSTAINING LONG TERM EVOLUTION TRAFFIC IN POWER LIMITED DUAL CONNECTIVITY SCENARIOS,” which are hereby expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications and, more particularly, to techniques and apparatus for maintaining Long Term Evolution (LTE) traffic in power-constrained dual connectivity scenarios.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless communication network may include several base stations (BS) that can support communication of several user equipments (UEs). User equipments (UEs) may communicate with base stations (BSs) via downlinks and uplinks. Downlinks (or forward links) refer to the communication link from a BS to a UE, while uplinks (or reverse links) refer to the communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, gNB, Access Point (AP), Radio Head, Transmit Receiving Point (TRP), New Radio (NR) BS, 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global level. New Radio (NR) (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by the Third Generation Partnership Project (3GPP). NR is designed to better support mobile broadband Internet access by improving spectrum efficiency, reducing costs, improving services, utilizing new spectrum, and using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation. Other open standards are better integrated to better support mobile broadband Internet access. However, as the demand for mobile broadband access continues to grow, there is a need for further improvements in LTE and NR technologies. Preferably, these improvements should be applicable to other multiple access technologies and telecommunication standards that adopt these technologies.

[0009] Overview

[0010] In some aspects, a method of wireless communication performed by a user equipment (UE) may include: determining that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determining that the UE is configured with a maximum transmit power for the first RAT in the dual connectivity mode that is less than a maximum transmit power threshold; determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and transmitting an indication that a secondary cell group has failed based at least in part on: determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power that is less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition.

[0011] In some aspects, a UE for wireless communication may include a memory and one or more processors operatively coupled to the memory. The memory and the one or more processors may be configured to: determine that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determine that the UE is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode; determine that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and transmit an indication that a secondary cell group has failed based at least in part on: determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition.

[0012] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. The one or more instructions, when executed by one or more processors of a UE, may cause the one or more processors to: determine that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determine that the UE is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode; determine that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and transmit an indication that a secondary cell group has failed based at least in part on: determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition.

[0013] In some aspects, an apparatus for wireless communications may include: means for determining that the apparatus is in an active communication session using a first radio access technology (RAT), wherein the apparatus is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; means for determining that the apparatus is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode; means for determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and means for transmitting an indication that a secondary cell group has failed based at least in part on determining that the apparatus is in an active communication session using the first RAT, determining that the apparatus is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition.

[0014] Aspects generally include methods, apparatus, systems, computer program products, non-transitory computer readable media, user equipment, base stations, wireless communication devices, and processing systems as substantially described herein with reference to and as illustrated in the accompanying drawings and specification.

[0015] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for illustration and description purposes and does not define limitations on the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to understand in detail the manner in which the above-stated features of the present disclosure are used, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings illustrate only certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0018] Figure 1 is a block diagram conceptually illustrating an example of a wireless communication network in accordance with various aspects of the present disclosure.

[0019] Figure 2is a block diagram conceptually illustrating an example of a base station in communication with a user equipment (UE) in a wireless communication network according to various aspects of the present disclosure.

[0020] Figure 3 is a diagram illustrating an example new radio non-standalone (NSA) architecture in accordance with various aspects of the present disclosure.

[0021] Figure 4 and 5 is a diagram illustrating an example of maintaining traffic for a first radio access technology (RAT) in a power-limited dual connectivity scenario in accordance with various aspects of the present disclosure.

[0022] Figure 6 is a diagram illustrating an example process, performed, for example, by user equipment, in accordance with various aspects of the present disclosure.

[0023] Detailed Description

[0024] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings herein, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is implemented independently or in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0025] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0026] Note that while various aspects may be described herein using terminology typically associated with 3G and / or 4G wireless technologies, various aspects of the present disclosure may be applied in communication systems based on other generations, such as 5G and later generations, including NR technologies.

[0027] Figure 11 is a diagram illustrating a network 100 in which various aspects of the present disclosure may be practiced. The network 100 may be an LTE network or some other wireless network, such as a 5G or NR network. The wireless network 100 may include several BSs 110 (shown as BSs 110a, BSs 110b, BSs 110c, and BSs 110d) and other network entities. A BS is an entity that communicates with a user equipment (UE) and may also be referred to as a base station, NR BS, B node, gNB, 5G B node (NB), access point, transmit receive point (TRP), etc. Each BS may provide communication coverage for a particular geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0028] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS110a may be a macro BS for macro cell 102a, BS110b may be a pico BS for pico cell 102b, and BS110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "Node B", "5GNB", and "cell" may be used interchangeably herein.

[0029] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the access network 100 via various types of backhaul interfaces, such as direct physical connections, virtual networks, and / or the like using any suitable transport network.

[0030] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , a relay station 110d may communicate with a macro BS 110a and a UE 120d to facilitate communication between the BS 110a and the UE 120d. A relay station may also be referred to as a relay BS, a relay base station, a relay, or the like.

[0031] The wireless network 100 may be a heterogeneous network including different types of BSs (e.g., macro BSs, pico BSs, femto BSs, relay BSs, etc.). These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0032] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly, for example, via a wireless or wired backhaul.

[0033] UE 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UE may also be referred to as an access terminal, terminal, mobile station, subscriber unit, station, etc. UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet device, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0034] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices such as sensors, meters, monitors, location tags, etc., which can communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network such as the Internet or a cellular network), for example, via a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component, a memory component, etc.

[0035] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0036] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols, vehicle-to-infrastructure (V2I) protocols, etc.), mesh networks, etc. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0037] As indicated above, Figure 1 These are provided as examples only. Other examples may differ from those described herein. Figure 1 Examples described.

[0038] Figure 2 A block diagram of a design 200 of a base station 110 and a UE 120 is shown, which may be Figure 1 One for each base station and one for each UE in the base station 110. Base station 110 may be equipped with T antennas 234a through 234t, and UE 120 may be equipped with R antennas 252a through 252r, where in general T≧1 and R≧1.

[0039] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for each UE based at least in part on the MCS selected for the UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI), etc.) and control information (e.g., CQI requests, grants, upper layer signaling, etc.), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS)) and synchronization signals (e.g., primary synchronization signals (PSS) and secondary synchronization signals (SSS)). The transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MOD) 232a to 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM, etc.) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a to 232t may be transmitted via T antennas 234a to 234t, respectively. According to various aspects described in more detail below, position coding may be used to generate synchronization signals to convey additional information.

[0040] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM, etc.) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The channel processor may determine reference signal received power (RSRP), received signal strength indicator (RSSI), reference signal received quality (RSRQ), channel quality indicator (CQI), etc. In some aspects, one or more components of UE 120 may be included in a housing.

[0041] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information from a controller / processor 280 (e.g., for reports including RSRP, RSSI, RSRQ, CQI, etc.). The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, if applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM, CP-OFDM, etc.), and transmitted to the base station 110. At the base station 110, uplink signals from the UE 120 as well as other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236, if applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide decoded data to a data sink 239 and decoded control information to a controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292.

[0042] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2Any other component(s) of the base station 110 may perform one or more techniques associated with maintaining traffic for the first radio access technology (RAT) in a power-constrained dual connectivity scenario, as described in greater detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) may perform or direct e.g. Figure 6 The operations of process 600 and / or other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. Scheduler 246 may schedule UEs for data transmission on the downlink and / or uplink.

[0043] In some aspects, a UE 120 may include: means for determining that the UE 120 is in an active communication session using a first radio access technology (RAT), wherein the UE 120 is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; means for determining that the UE 120 is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode; means for determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; and means for transmitting an indication that a secondary cell group has failed based at least in part on determining that the UE 120 is in an active communication session using the first RAT, determining that the UE 120 is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition; and the like. In some aspects, such means may include a method for combining Figure 2 One or more components of UE 120 are described.

[0044] As indicated above, Figure 2 These are provided as examples only. Other examples may differ from those described herein. Figure 2 Examples described.

[0045] Figure 3 is a diagram illustrating an example new radio non-standalone (NSA) architecture in accordance with various aspects of the present disclosure.

[0046] like Figure 3As shown, in New Radio (NR) or 5G NSA mode, UE 120 can communicate with both eNB (e.g., 4G base station 110) and gNB (e.g., 5G base station 110), and eNB and gNB can communicate with 4G / LTE core network (shown as Evolved Packet Core (EPC) including Mobility Management Entity (MME), Packet Data Network (PDN) Gateway (PGW), Serving Gateway (SGW), etc.) (e.g., directly or indirectly). Figure 3 , PGW and SGW are collectively shown as P / SGW. In some aspects, the eNB and gNB may be co-located at the same base station 110. In some aspects, the eNB and gNB may be included in different base stations 110 (e.g., may not be co-located).

[0047] like Figure 3 As further shown in , in some aspects, a wireless network that permits operation in 5G NSA mode may permit such operation by using a master cell group (MCG) for a first RAT (e.g., LTE RAT, 4G RAT, etc.) and a secondary cell group (SCG) for a second RAT (e.g., NR RAT, 5G RAT, etc.). In this case, the UE 120 may communicate with the eNB via the master cell group and may communicate with the gNB via the secondary cell group. In some aspects, the master cell group may anchor the network connection between the UE 120 and the 4G / LTE core network (e.g., for mobility, coverage, control plane information, etc.), and the secondary cell group may be added as an additional carrier to increase throughput (e.g., for data traffic, user plane information, etc.). In some aspects, the gNB and the eNB may not pass user plane information between each other. This NSA architecture may be referred to as option 3a.

[0048] In some aspects, the 5G NSA mode may be referred to as an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) - New Radio (NR) Dual Connectivity (ENDC) mode. In some aspects, a UE 120 operating in ENDC mode with dual connectivity with an LTE base station 110 (e.g., an eNB) and an NR base station 110 (e.g., a gNB) may be referred to as an ENDC UE.

[0049] When the UE 120 is operating in ENDC mode, the maximum transmit power of the UE 120 may be split between LTE communications on the primary cell group and NR communications on the secondary cell group. For example, as indicated by reference numeral 305, the network (e.g., base station 110, eNB, gNB, etc.) may indicate a maximum transmit power (shown as P-maxEUTRA) for LTE communications on the primary cell group (MCG) for ENDC mode. In addition, as indicated by reference numeral 310, the network (e.g., base station 110, eNB, gNB, etc.) may indicate a maximum transmit power (shown as P-NR (e.g., P-maxNR)) for NR communications on the secondary cell group (SCG) for ENDC mode. Because the UE 120 may transmit on both the MCG and the SCG simultaneously, the (logarithmically) combined value of P-maxEUTRA and P-NR may not exceed the overall maximum transmit power (e.g., P-max, etc.) of the UE 120. For example, if the UE 120 has a power class with a maximum transmit power of 23 decibel milliwatts (dBm), the combined value of P-maxEUTRA and P-NR must be less than or equal to 23 dBm.

[0050] Due to the above requirements, the UE 120 may be configured with a maximum transmit power (P-maxEUTRA) for LTE communications in ENDC mode that is less than the maximum transmit power for LTE communications when not operating in ENDC mode (e.g., less than the maximum transmit power of the UE power class (23dBm, 26dBm, P-max, etc.). As a result, some LTE communications may be dropped, especially in scenarios where the UE 120 is operating under poor network conditions (e.g., indoors, at the edge of a cell, etc.). For example, when the UE 120 is operating in ENDC mode, some high priority LTE communication sessions (such as voice calls (e.g., Voice over LTE (VoLTE) calls)) may use LTE and may be carried via a primary cell group (e.g., because the SCG lacks the ability to handle the traffic, the SCG has a lower priority, etc.). Since the maximum transmit power for those LTE communication sessions is lower in ENDC mode, some of those LTE communication sessions may be dropped. Some techniques and devices described herein help maintain LTE communication sessions when the UE 120 is operating in ENDC mode. Additional details are described below.

[0051] Although some operations are described herein in conjunction with the ENDC mode, these operations may be performed in conjunction with any type of dual connectivity mode, generally referred to as multi-radio dual connectivity (MRDC).

[0052] As indicated above, Figure 3are provided as examples. Other examples may differ from the reference Figure 3 Examples described.

[0053] Figure 4 is a diagram illustrating an example 400 of maintaining traffic for a first radio access technology (RAT) in a power-limited dual connectivity scenario in accordance with various aspects of the present disclosure.

[0054] As indicated by reference numeral 405, the UE 120 and the base station 110 (e.g., eNB, gNB, etc.) may operate in a dual connectivity mode (such as ENDC mode). In the dual connectivity mode, communications using a first RAT (e.g., LTE RAT, 4G RAT, etc.) may be carried via a primary cell group (MCG), while communications using a second RAT (e.g., NR RAT, 5G RAT, etc.) may be carried via a secondary cell group (SCG).

[0055] As indicated by reference numeral 410, the UE 120 may be in an active communication session using the first RAT. The active communication session may include, for example, a voice call (e.g., a VoLTE call), a high priority communication session on the first RAT (e.g., having a priority satisfying a threshold, one or more quality of service (QoS) parameters satisfying one or more corresponding thresholds, a QoS class indicator (QCI) value satisfying a threshold, etc.), etc. In some aspects, the UE 120 may determine that the UE 120 is in such an active communication session using the first RAT, that the priority associated with the active communication session satisfies the threshold, that the active communication session is a particular type of communication session (e.g., a voice call, a VoLTE call), etc.

[0056] As indicated by reference numeral 415, UE 120 may be configured with a maximum transmit power (e.g., shown as P-maxEUTRA) for the first RAT in dual connectivity mode that is less than a maximum transmit power threshold. Figure 3 As described, in the dual connectivity mode, the overall maximum transmit power (e.g., P-max, etc.) of the UE 120 can be split between the maximum transmit power (e.g., P-maxEUTRA) for LTE communication in the dual connectivity mode and the maximum transmit power (e.g., P-NR) for NR communication in the dual connectivity mode. In some aspects, the values ​​of P-maxEUTRA and P-NR can be indicated to the UE 120 by the base station 110.

[0057] In some aspects, the maximum transmit power threshold may be set equal to the overall maximum transmit power of the UE 120 (e.g., based at least in part on the power class of the UE 120). Additionally or alternatively, the maximum transmit power threshold may be set equal to the maximum transmit power of the UE on the first RAT when not operating in the dual connectivity mode (e.g., which may be denoted as P-max). For example, the maximum transmit power threshold may be set to the maximum transmit power of the power class of the UE 120 (such as 23 dBm, 26 dBm, etc.). In some aspects, the UE 120 may determine that the UE 120 is configured with a maximum transmit power (e.g., P-maxEUTRA) for the first RAT in the dual connectivity mode that is less than the maximum transmit power threshold.

[0058] As indicated by reference numeral 420, UE 120 may determine that one or more power parameters (e.g., a power headroom (PHR) value, etc.) and / or one or more performance parameters (e.g., an estimated uplink block error rate (BLER)) meet a condition. For example, UE 120 may determine that the PHR value is less than or equal to a threshold value (e.g., a first threshold value). This may indicate that UE 120 is in a poor coverage scenario. Additionally or alternatively, UE 120 may determine that the estimated uplink BLER is greater than or equal to a threshold value (e.g., a second threshold value). This may indicate that UE 120 is in a poor coverage scenario, is experiencing poor performance, cannot meet a BLER target, etc.

[0059] As indicated by reference numeral 425, the UE 120 may transmit an indication that the secondary cell group has failed. In some aspects, the indication may be transmitted based at least in part on a determination that the UE 120 is in an active communication session using the first RAT, based at least in part on a determination that the UE 120 is configured with a maximum transmit power less than a maximum transmit power threshold, based at least in part on a determination that at least one of a PHR value or an estimated BLER satisfies a condition, etc. For example, when the UE 120 is operating in a dual connectivity mode with power split between LTE and NR communications, when the UE 120 determines a lower PHR value indicating that the UE 120 is in a poor coverage scenario, when the UE 120 determines a higher estimated uplink BLER indicating poor performance, and when the UE 120 determines that there are active communication sessions (e.g., active communication sessions of a particular type, high priority active communication sessions, etc.) using the first RAT, the UE 120 may indicate that the SCG has failed.

[0060] In some aspects, the UE 120 may transmit an indication that the secondary cell group has failed in a secondary cell group failure information message for NR (e.g., an SCGfailureinformationNR message). The UE 120 will normally transmit measurement results (e.g., for NR cells, for secondary cell groups, etc.) in the secondary cell group failure information message to permit those NR cells to be added to the SCG when parameters of one or more NR cells (e.g., reference signal received power (RSRP) parameters, reference signal received quality (RSRQ) parameters, etc.) meet conditions. However, in order to prevent NR cells from being added to the SCG during an active communication session using LTE, the UE 120 may avoid including measurement results for NR cells in the secondary cell group failure information message for NR. Therefore, in some aspects, the message carrying the indication that the SCG has failed (e.g., the secondary cell group failure information message for NR) may not include measurement results for the second RAT (e.g., the NR RAT).

[0061] Additionally or alternatively, in combination with Figure 5 As described in more detail, UE 120 may avoid measuring the cellular cells of the second RAT and / or may avoid transmitting the results of such measurements to base station 110 (e.g., until the active communication session is terminated, until the PHR value no longer satisfies the condition, until the estimated uplink BLER no longer satisfies the condition, etc.). In this way, resources (e.g., memory resources, processing resources, battery power, etc.) of UE 120 and base station 110 may be saved by avoiding making, reporting, or analyzing such measurements. In addition, this may prevent the cellular cells of the second RAT from being added to the SCG during an active communication session using the first RAT, thereby improving the performance of the active communication session, allowing the overall maximum transmit power of UE 120 to be used exclusively for the active communication session, etc.

[0062] As a result of indicating such an SCG failure, the secondary cell group may be torn down, as indicated by reference numeral 430. This may permit UE 120 to dedicate all transmit power (e.g., the overall maximum transmit power of UE 120) to active communication sessions using the first RAT, thereby reducing the likelihood that the active communication sessions will be dropped, improving performance, enhancing user experience, saving network resources (e.g., by dropping the SCG), saving UE and base station resources (e.g., memory resources, processing resources, battery power, etc.) that would otherwise be used to maintain the SCG, etc.

[0063] As indicated above, Figure 4 are provided as examples. Other examples may differ from the reference Figure 4 Examples described.

[0064] Figure 5 is a diagram illustrating an example 500 of maintaining traffic for a first radio access technology (RAT) in a power-limited dual connectivity scenario in accordance with various aspects of the present disclosure.

[0065] continue Figure 4 , and as shown in reference numeral 505, UE 120 may transmit an indication that a failure has occurred in the secondary cell cluster, as described above in conjunction with Figure 4 as described.

[0066] As indicated by reference numeral 510, UE 120 may refrain from measuring cells of the second RAT and / or may refrain from reporting measurement results of such measurements (if performed). In some aspects, UE 120 may refrain from measuring cells of the second RAT and / or reporting measurements of cells of the second RAT based at least in part on transmitting an indication of a secondary cell group failure. Additionally or alternatively, UE 120 may refrain from measuring cells of the second RAT and / or reporting measurements of cells of the second RAT based at least in part on determining that UE 120 is in an active communication session using the first RAT, based at least in part on determining that UE 120 is configured with a maximum transmit power less than a maximum transmit power threshold, based at least in part on determining that at least one of a PHR value or an estimated BLER satisfies a condition, etc.

[0067] In some aspects, UE 120 may avoid measuring cells of the second RAT and may therefore avoid reporting measurement results for the second RAT to base station 110. In this case, resources of UE 120 may be saved because UE 120 does not need to measure or report measurement results, and resources of base station 110 may be saved because base station 110 does not need to receive or process such measurement results. In addition, network resources may be saved because such measurement results do not need to be transmitted.

[0068] However, in some aspects, the UE 120 may continue to measure the cells of the second RAT, but may avoid reporting measurement results of such measurements to the base station 110. In this case, as described above, network resources and resources of the base station 110 may still be saved, and resources of the UE 120 associated with transmitting the measurement results may also be saved. In this case, the UE 120 may store the measurement results and may prepare such measurement results for transmission to the base station 110 upon determining that the SCG is to be reestablished, thereby resulting in faster reestablishment of the SCG, which may result in better performance, lower latency, higher throughput, higher reliability, etc.

[0069] As indicated by reference numeral 515, the UE 120 may determine that the SCG is to be reestablished when one or more conditions are met. For example, the UE 120 may determine that the SCG is to be reestablished based at least in part on determining that an active communication session using the first RAT has terminated (e.g., a voice call, a VoLTE call, etc. has terminated). In this case, the overall maximum transmit power does not have to be dedicated to the active communication session using the first RAT, so the UE 120 may determine that the SCG can be reestablished and the overall maximum transmit power can be split between communications on the MCG and the SCG. In some aspects, the UE 120 may wait until a timer expires before determining that the SCG is to be reestablished, and may determine that the SCG is to be reestablished only if another active communication session using the first RAT is not established while the timer is running. In some aspects, the timer may be started upon termination of the active communication session. In this way, the UE 120 may avoid reestablishing the SCG when the active communication session is terminated unexpectedly, prematurely (e.g., due to poor coverage), etc.

[0070] Additionally or alternatively, UE 120 may determine that the condition is no longer satisfied (e.g., in combination with the above) based at least in part on determining that one or more power parameters (e.g., PHR value, etc.) and / or one or more performance parameters (e.g., estimated uplink BLER) no longer satisfy the condition. Figure 4 The conditions described above) and / or different conditions are met to determine that the SCG is to be reestablished. For example, UE 120 may determine that the PHR value is greater than or equal to a threshold (e.g., a first threshold or a third threshold different from the first threshold). This may indicate that UE 120 is in a good coverage scenario. Additionally or alternatively, UE 120 may determine that the estimated uplink BLER is less than or equal to a threshold (e.g., a second threshold or a fourth threshold different from the second threshold). This may indicate that UE 120 is in a good coverage scenario, is experiencing good performance, is able to meet BLER targets, etc.

[0071] As indicated by reference numeral 520, based at least in part on determining to reestablish the SCG, the UE 120 may trigger measurement reporting for the second RAT. For example, the UE 120 may resume and / or start transmission of measurement reports for the second RAT (e.g., reporting of RSRP parameters for cells of the second RAT, reporting of RSRQ parameters, etc.). Additionally or alternatively, if the UE 120 had previously suspended measurements for the second RAT, the UE 120 may resume such measurements to facilitate measurement reporting for the second RAT.

[0072] In some aspects, UE 120 may wait until the hysteresis timer expires before resuming measurements for the second RAT and / or reporting the measurement results for the second RAT. In some aspects, the hysteresis timer may be started upon transmitting an indication of an SCG failure to base station 110, upon determining that the indication is to be transmitted, etc. This may prevent premature reestablishment of the SCG due to fluctuations in PHR values, estimated uplink BLER values, etc.

[0073] By reestablishing the SCG after an active communication session has terminated and / or when the conditions that led to the indicated SCG failure have improved (e.g., improvements to PHR values, estimated uplink BLER values, etc.), UE 120 can enable better performance, lower latency, higher throughput, higher reliability, etc.

[0074] As indicated above, Figure 5 are provided as examples. Other examples may differ from the reference Figure 5 Examples described.

[0075] Figure 6 is a diagram illustrating an example process 600, performed, for example, by a UE, in accordance with various aspects of the present disclosure. Example process 600 is an example in which a UE (eg, UE 120, etc.) performs operations associated with maintaining traffic of a first radio access technology (RAT) in a power-limited dual connectivity scenario.

[0076] like Figure 6 As shown, in some aspects, process 600 may include determining that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT (block 610). For example, the UE (e.g., using controller / processor 280, etc.) may determine that the UE is in an active communication session using the first RAT, as described above. In some aspects, the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for the second RAT.

[0077] like Figure 6 As shown, in some aspects, process 600 may include determining that the UE is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode (block 620). For example, the UE (e.g., using the controller / processor 280, etc.) may determine that the UE is configured with a maximum transmit power less than a maximum transmit power threshold for the first RAT in the dual connectivity mode, as described above.

[0078] like Figure 6As shown, in some aspects, process 600 may include determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition (block 630). For example, the UE (e.g., using controller / processor 280, etc.) may determine that at least one of a power headroom (PHR) value or an estimated uplink BLER satisfies a condition, as described above.

[0079] like Figure 6 As shown, in some aspects, process 600 may include transmitting an indication that a secondary cell cluster has failed based at least in part on determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition (block 640). For example, the UE (e.g., using the controller / processor 280, the transmit processor 264, the TX MIMO processor 266, the MOD 254, the antenna 252, etc.) may transmit an indication that a secondary cell cluster has failed based at least in part on determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power less than a maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies a condition, as described above.

[0080] Process 600 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in conjunction with one or more other processes described elsewhere herein.

[0081] In a first aspect, the first RAT is a Long Term Evolution RAT and the second RAT is a New Radio RAT.

[0082] In a second aspect, alone or in combination with the first aspect, the maximum transmit power threshold is a maximum transmit power of the UE on the first RAT when not operating in dual connectivity mode.

[0083] In a third aspect, alone or in combination with one or more of the first and second aspects, the maximum transmit power threshold is a maximum transmit power of a power class of the UE.

[0084] In a fourth aspect, alone or in combination with one or more of the first to third aspects, determining that at least one of the PHR value or the estimated uplink BLER satisfies a condition includes at least one of the following: determining that the PHR value is less than or equal to a first threshold, determining that the estimated uplink BLER is greater than or equal to a second threshold, or a combination thereof.

[0085] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, the indication is transmitted in a secondary cell group failure information message.

[0086] In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, the indication does not include measurement results for the second RAT.

[0087] In a seventh aspect, either alone or in combination with one or more of the first to sixth aspects, process 600 includes avoiding performing measurements for a second RAT or reporting at least one of measurement results for the second RAT based at least in part on: determining that the UE is in an active communication session using the first RAT, determining that the UE is configured with a maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated BLER satisfies the condition.

[0088] In an eighth aspect, either alone or in combination with one or more of aspects 1 to 7, process 600 comprises determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition; and triggering a measurement report for a second RAT based at least in part on determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition.

[0089] In a ninth aspect, alone or in combination with one or more of the first to eighth aspects, triggering the measurement report causes the secondary cell group to be reestablished.

[0090] In the tenth aspect, alone or in combination with one or more of the first to ninth aspects, determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition includes: determining that the PHR value is greater than or equal to a first threshold, determining that the estimated uplink BLER is less than or equal to a second threshold, or a combination thereof.

[0091] In an eleventh aspect, alone or in combination with one or more of the first to tenth aspects, the UE is configured to trigger a measurement report for the second RAT based at least in part on determining that a hysteresis timer has expired.

[0092] In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, process 600 includes determining that the active communication session has terminated; and triggering a measurement report for the second RAT based at least in part on determining that the active communication session has terminated.

[0093] In a thirteenth aspect, alone or in combination with one or more of the first to twelfth aspects, the active communication session comprises at least one of: a voice call, a high priority communication session, or a combination thereof.

[0094] although Figure 6 An example block diagram of process 600 is shown, but in some aspects, process 600 may include Figure 6 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 600. Additionally or alternatively, two or more blocks of the process 600 may be executed in parallel.

[0095] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0096] As used herein, the term "component" is intended to be broadly interpreted as hardware, firmware, or a combination of hardware and software. As used herein, a processor is implemented with hardware, firmware, or a combination of hardware and software.

[0097] Some aspects are described herein in conjunction with thresholds. As used herein, satisfying a threshold may mean: a value is greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc.

[0098] It will be apparent that the systems and / or methods described herein can be implemented in different forms of hardware, firmware, or a combination of hardware and software. The actual dedicated control hardware or software code used to implement these systems and / or methods does not limit the various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes—it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0099] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or not disclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. The phrase quoting "at least one of" a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc, and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc, and ccc, or any other sorting of a, b and c).

[0100] Elements, actions or instructions used herein should not be interpreted as critical or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more items, and can be used interchangeably with "one or more". In addition, as used herein, the terms "set (set)" and "group" are intended to include one or more items (e.g., related items, non-related items, combinations of related and non-related items, etc.), and can be used interchangeably with "one or more". In the case of intending to have only one item, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including" etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated.

Claims

1. A wireless communication method performed by a user equipment (UE), comprising: determining that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determining that the UE is configured with a maximum transmit power for the first RAT in the dual connectivity mode that is less than a maximum transmit power threshold; determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; as well as Transmitting an indication that the secondary cell cluster has failed is based at least in part on determining that the UE is in the active communication session using the first RAT, determining that the UE is configured with the maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition. 2 . The method of claim 1 , wherein the first RAT is a Long Term Evolution RAT and the second RAT is a New Radio RAT.

3. The method of claim 1, wherein the maximum transmit power threshold is a maximum transmit power of the UE on the first RAT when not operating in the dual connectivity mode. The method according to claim 1 , wherein the maximum transmit power threshold is a maximum transmit power of a power class of the UE.

5. The method of claim 1 , wherein determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition comprises at least one of: determining that the PHR value is less than or equal to a first threshold, determining that the estimated uplink BLER is greater than or equal to a second threshold, or Its combination.

6. The method of claim 1, wherein the indication is transmitted in a secondary cell group failure information message.

7. The method of claim 1, wherein the indication does not include measurement results for the second RAT.

8. The method of claim 1, further comprising: Avoiding at least one of performing measurements for the second RAT or reporting measurement results for the second RAT based at least in part on: determining that the UE is in the active communication session using the first RAT, determining that the UE is configured with the maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition.

9. The method of claim 1, further comprising: determining that the active communication session has been terminated; as well as Measurement reporting for the second RAT is triggered based at least in part on determining that the active communication session has terminated.

10. The method of claim 9, wherein triggering the measurement report causes the secondary cell cluster to be reestablished.

11. The method of claim 1, further comprising: determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition; as well as Measurement reporting for the second RAT is triggered based at least in part on determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition.

12. The method of claim 11, wherein triggering the measurement report causes the secondary cell cluster to be reestablished.

13. The method of claim 11, wherein determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition comprises: determining that the PHR value is greater than or equal to a first threshold, determining that the estimated uplink BLER is less than or equal to a second threshold, or Its combination.

14. The method of claim 11, wherein the UE is configured to trigger a measurement report for the second RAT based at least in part on determining that a hysteresis timer has expired.

15. The method of claim 1, wherein the active communication session comprises at least one of: Voice calls, A high priority communication session, or Its combination.

16. A user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors operatively coupled to the memory, the memory and the one or more processors being configured to: determining that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determining that the UE is configured with a maximum transmit power for the first RAT in the dual connectivity mode that is less than a maximum transmit power threshold; determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; as well as Transmitting an indication that the secondary cell cluster has failed is based at least in part on determining that the UE is in the active communication session using the first RAT, determining that the UE is configured with the maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition. 17 . The UE of claim 16 , wherein the first RAT is a Long Term Evolution RAT, and the second RAT is a New Radio RAT.

18. The UE of claim 16, wherein the maximum transmit power threshold is at least one of: a maximum transmit power of the UE on the first RAT when not operating in the dual connectivity mode, or The maximum transmit power of the power class of the UE.

19. The UE of claim 16, wherein the one or more processors, upon determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition, are configured to perform at least one of the following operations: determining that the PHR value is less than or equal to a first threshold, determining that the estimated uplink BLER is greater than or equal to a second threshold, or Its combination.

20. The UE of claim 16, wherein the indication is transmitted in a secondary cell group failure information message.

21. The UE of claim 16, wherein the indication does not include a measurement result for the second RAT.

22. The UE of claim 16, wherein the one or more processors are further configured to avoid performing at least one of measurements for the second RAT or reporting measurement results for the second RAT based at least in part on: determining that the UE is in the active communication session using the first RAT, determining that the UE is configured with the maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition.

23. The UE of claim 16, wherein the one or more processors are further configured to: determining that the active communication session has terminated; and Measurement reporting for the second RAT is triggered based at least in part on determining that the active communication session has terminated.

24. The UE of claim 23, wherein triggering the measurement report causes the secondary cell cluster to be reestablished.

25. The UE of claim 16, wherein the one or more processors are further configured to: determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition; and Measurement reporting for the second RAT is triggered based at least in part on determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition.

26. The UE of claim 25, wherein triggering the measurement report causes the secondary cell cluster to be reestablished.

27. The UE of claim 25, wherein the one or more processors, upon determining that at least one of the PHR value or the estimated uplink BLER no longer satisfies the condition, are configured to: determining that the PHR value is greater than or equal to a first threshold, determining that the estimated uplink BLER is less than or equal to a second threshold, or Its combination.

28. The UE of claim 16, wherein the active communication session comprises at least one of: Voice calls, A high priority communication session, or Its combination.

29. A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising: One or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to: determining that the UE is in an active communication session using a first radio access technology (RAT), wherein the UE is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; determining that the UE is configured with a maximum transmit power for the first RAT in the dual connectivity mode that is less than a maximum transmit power threshold; determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; as well as Transmitting an indication that the secondary cell cluster has failed is based at least in part on determining that the UE is in the active communication session using the first RAT, determining that the UE is configured with the maximum transmit power less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition.

30. A device for wireless communication, comprising: means for determining that the device is in an active communication session using a first radio access technology (RAT), wherein the device is operating in a dual connectivity mode using a primary cell group for the first RAT and a secondary cell group for a second RAT; means for determining that the device is configured with a maximum transmit power for the first RAT in the dual connectivity mode that is less than a maximum transmit power threshold; means for determining that at least one of a power headroom (PHR) value or an estimated uplink block error rate (BLER) satisfies a condition; as well as and means for transmitting an indication that the secondary cell cluster has failed based at least in part on determining that the device is in the active communication session using the first RAT, determining that the device is configured with the maximum transmit power that is less than the maximum transmit power threshold, and determining that at least one of the PHR value or the estimated uplink BLER satisfies the condition.

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